Electric bell.



Y W'. J. MURRAY.

ELECTRIC BELL. APPLIOATION 111.21) 511mg; 191w.

924,180. I Patented June 8, 1909.

llllllbVIIIIlllllllllllIllII/IIIIIW a AEJ/ UNITED STATES PATENT onruon- WILLIAM J. MURRAY, OF LEAYENWORTH, KANSAS, ASSIGNOR OF ONE-TWENTIETH TO HERBERT W. WOLCOTT, OF LEAVENWORTH, KANSAS.

' ELECTRIC BELL.

Specification d1 Letters Patent.

-Patented .l'une a, 1909.

Application filed September 3.1901. SerialNc. 351,012.

To all whom it may concern:

Be it known that I, lVinLIAii J. Mummy, a citizen of the United States, residing at bell and means whereby the completion of the circuit in which the bellis located shall result in an automatic flow of the current through different paths alternately to effect vibratory action of the bell-clapper without breaking the circuit'at any time and consequently without producing a spark-irrespective' of the electro-motive'force of the current.

A still further object is to produce a device of this character. to-operate in a circuit which includes an electromagnet having an armature" for e'fi'ecting the short-cir cuitin of-the current each time it is at tracts and for breaking such short ci cuit etize ventionconsists in certainnovel and peculiar'features of construction and organiza-' tron as hereinafter described and claimed;

and in order that it may "be fully under stood reference is to be had to the accompanying drawing in which-- Figure 1, is a side view of embodyin my invention, a parttbeing in section. .i 2, is an. edge view of the same with the bel broken away. Fig. 3, is a diagrammatic view.

In thesaid drawin ,iljindicates a suitable frame having as, ot 2; and ears 3 at opposite sides of the slot.

4 is a cross piece having'a groove 5 to re ceive one arm of the frame and a screw-bolt 6 whereby'said frame and 'an electromagnet 7 are clamped to the cross-piece, the latter being carried by. any suitablesupport-as shown at 8. g

Extending through the slot 2 and pivoted -to cars 3 is an armature 9 equipped with a cla per 10 at one at the other end wit a contactplatell, an his'iilating plate 12 being referabl interposed between the contact p ate and t earmature.

anelectric bell .to swing back to its original position.

13 is an insulating plate secured to the frame and disposed at the opposite side of the armature from the contact plate, by preference, so as to limit the movement of preferred that said contact plates '14 sh be resilient but that they shall not yield .sufliciently to let the armature come into contact with and possibly freeze to the magnet.

15 indicates a source of electric current supply, shown in this instance as a battery,-

16 1s a conductor leading therefrom to one of the plates 14-one end of the magnet coil being also connected by conductor 17 to said plate. 18 is a conductor connecting the battery with the other contact late 14 and .to said contact the other end, 0 the magnet coil is connected by conductor 19.

20 indicates a suitable make-and-break 'devicefor the circuit.

21 is a gong which preferably surrounds I the frame and clapper and is secured by bolt 22 or otherwise to one end of the cross mac 4.

As arranged the weight of the c a per holds the armature yieldingly retracted om the magnet andhence with contact plate 11 withdrawn froin'contacts 14 so that the instant the circuit is completed the magnet is energized and attracts its armature and therefore causes the clapper to strike the gong. At the same time the contact plate 11 engagescontacts I4 and shunts the current through the shorter path constituted by said contacts and contact (plate so" as to demagnetize the magnet an permit the armature In the return movement of the armature it breaks the short circuit and at the same instant and without any break in the circuit the magnet becomes reenergized and reattracts .the armature with the result before mentioned. It will thus be seen that as long as the circuit is completed there is a constant vibrato action of the armature and that be- .cause 0 the quick shunting of the circuit back and-forth there is no chance for the coil to be burned out. It is therefore obvious that a bell of this character can be used in the lamp circuit of a trolley car, as a crossing bell for intcrurban and trunk lines or m a door bell circuit. .The device will work without regard to its position, that is Whether arranged with the magnet upright, as shown, or with it inverted or arranged horizontally, and it is to be understood that by dispensing with the bell and clapper, the device forms a perfectly operating buzzer.

From the above description it will be apparent that I have produced an electric bell possessing the features of advantage enumerated as desirable and I wish it to be understood that I do not desire to be restricted to the. exact details ofconstruction shown and described as obvious modifications Will suggest themselves to one skilled in the art.- I

Having thus described the invention what- I claim as new and desire to secure by Letters Patent is:- i

The combination of a suitable support, a

cross piece carried thereby, a gong secured to and mclosin'g the cross plece, a frame carried by the cross piece, an electro-magnet carried by the frame, an armature overlying the magnet and pivoted to the frame atone side of the magnet and terminating at the same end of the armature and adapted when the latter is attracted by the magnet to electric ally connect said pair of contacts, a source of-electric current supply, conductors in circuit therewith and with said pair of contacts and the magnet, and amake-and-break 2:

device in circuit with one of said conductors. In testimony whereof I athx my signature, 1n the presence of two witnesses.

IVILLIAM J. MURRAY.

\Vitnesses:

, HnnBERr IV. VVOLCOTT HARRYW. EDBRY. 

